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Single photon sources are an integral part of various quantum technologies,and solid state quantum emitters at room temperature appear as a promisingimplementation. We couple the fluorescence of individual silicon vacancycenters in nanodiamonds to a tunable optical microcavity to demonstrate asingle photon source with high efficiency, increased emission rate, andimproved spectral purity compared to the intrinsic emitter properties. We use afiber-based microcavity with a mode volume as small as $3.4~\lambda^3$ and aquality factor of $1.9\times 10^4$ and observe an effective Purcell factor ofup to 9.2. We furthermore study modifications of the internal rate dynamics andpropose a rate model that closely agrees with the measurements. We observelifetime changes of up to 31%, limited by the finite quantum efficiency of theemitters studied here. With improved materials, our achieved parameters predictsingle photon rates beyond 1 GHz.

Cavity-enhanced single photon source based on the silicon vacancy center in diamond